// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2018 Broadcom */ #include <linux/module.h> #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/thermal.h> /* * In stingray thermal IO memory, * Total Number of available TMONs MASK is at offset 0 * temperature registers BASE is at 4 byte offset. * Each TMON temperature register size is 4. */ #define SR_TMON_TEMP_BASE(id) ((id) * 0x4) #define SR_TMON_MAX_LIST 6 struct sr_tmon { unsigned int crit_temp; unsigned int tmon_id; struct sr_thermal *priv; }; struct sr_thermal { void __iomem *regs; unsigned int max_crit_temp; struct sr_tmon tmon[SR_TMON_MAX_LIST]; }; static int sr_get_temp(struct thermal_zone_device *tz, int *temp) { struct sr_tmon *tmon = thermal_zone_device_priv(tz); struct sr_thermal *sr_thermal = tmon->priv; *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id)); return 0; } static const struct thermal_zone_device_ops sr_tz_ops = { .get_temp = sr_get_temp, }; static int sr_thermal_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct thermal_zone_device *tz; struct sr_thermal *sr_thermal; struct sr_tmon *tmon; struct resource *res; u32 sr_tmon_list = 0; unsigned int i; int ret; sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL); if (!sr_thermal) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENOENT; sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start, resource_size(res), MEMREMAP_WB); if (IS_ERR(sr_thermal->regs)) { dev_err(dev, "failed to get io address\n"); return PTR_ERR(sr_thermal->regs); } ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list); if (ret) return ret; tmon = sr_thermal->tmon; for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) { if (!(sr_tmon_list & BIT(i))) continue; /* Flush temperature registers */ writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i)); tmon->tmon_id = i; tmon->priv = sr_thermal; tz = devm_thermal_of_zone_register(dev, i, tmon, &sr_tz_ops); if (IS_ERR(tz)) return PTR_ERR(tz); dev_dbg(dev, "thermal sensor %d registered\n", i); } return 0; } static const struct of_device_id sr_thermal_of_match[] = { { .compatible = "brcm,sr-thermal", }, {}, }; MODULE_DEVICE_TABLE(of, sr_thermal_of_match); static struct platform_driver sr_thermal_driver = { .probe = sr_thermal_probe, .driver = { .name = "sr-thermal", .of_match_table = sr_thermal_of_match, }, }; module_platform_driver(sr_thermal_driver); MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>"); MODULE_DESCRIPTION("Stingray thermal driver"); MODULE_LICENSE("GPL v2");